map/reduce

http://research.google.com/archive/mapreduce.html

http://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/0014317852443934a86aa5bb5ea47fbbd5f35282b331335000

【用通俗易懂的大白话讲解Map/Reduce原理】http://blog.youkuaiyun.com/lifuxiangcaohui/article/details/22675437

Mapreduce是一种编程模型，是一种编程方法，抽象理论。